Sometimes a humidifier has a hygrometer built into the product. Often those can be expensive humidifiers. And, often they don’t have the other features you might want.

In this post, we review the top 3 hygrometers. We also pick which one is the best hygrometer.

And, we show you where to buy a hygrometer (HINT: Click the link above for the best one).

Most Accurate Hygrometer

There are many different hygrometer devices out there.

To know whether they are truly accurate, you don’t have to to have sophisticated expensive equipment.

In this WikiHow tutorial, it describes exactly what you need to do to test your hygrometer.

If your hygrometer doesn’t read 75 like the tutorial suggests, you can adjust the hygrometer to set it to the baseline number to 75.

If your hygrometer isn’t fancy, you can just put a piece of tape with the number to add/subtract from what is shown on the hygrometer.

Types of Hygrometers

There are several types of hygrometers.

Some of the modern versions use technology that is cheaper, but less accurate. This can be fine for many applications where it’s not that important if the measurement is off by a percentage point or two.

Resistive (measures changes in electrical resistance for a material due to humidity)

Capacitive (measures humidity change of the dielectric constant of a polymer or metal oxide material)

Gravimetric (measures the mass of an air sample compared to an equal volume of dry air)

Thermal (measures change in thermal conductivity because of humidity )

The measurement of humidity is one of the most difficult metrics to accurately measure. Hence, the many different types.

Of the types of hygrometers listed above, the Gravimetric is considered the most accurate and most expensive. They are so expensive, they are typically only used to calibrate other types of hygrometers.

The Chilled mirror dew point hygrometer is also considered very accurate. However, they are typically high maintenance as they require to be cleaned very often.

Some of the less accurate hygrometers are the Resistive and Capacitive hygrometers. Although, many modern hygrometers are constructed using these methods.

Older hygrometer that were invented hundreds of years ago include the Dry and Wet bulb, and the Hair Tension hygrometers.

One of the problems is that for some types of hygrometers, the internals are difficult to maintain. Meaning they don’t keep their properties over time and therefore become inaccurate over time based on external influences.

Best Hygrometer For Home Use

Here are some of our favorites that fans around the league use to manage weather conditions. The General Managers of teams in the Lotion Challenge league know where to buy a hygrometer. They just come here.

The reviews for this device are absolutely incredible. Approximately 98% of reviewers give it at least 3 stars. And, ZERO reviewers have given 1 star. To have more than 100 reviews with ZERO 1 star reviews is truly amazing.